html,
body {
    overflow: hidden;
}

/* footer */
.footerBox {
    font-size: 14px;
    color: #fff;
    height: 35px;
    line-height: 35px;
    background: #3a3d42;
    text-align: center;
}

/* header */
.headerBox {
    color: #fff;
    display: flex;
    justify-content: space-between;
    height: 52px;
    line-height: 52px;
    background: #3a3d42;
    box-shadow: 0px 2px 5px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

.headerBox .logo {
    width: 18%;
    text-align: center;
    font-size: 20px;
    /* 字符间距 */
    letter-spacing: 3px;
}

.headerBox .baseBox {
    width: 18%;
    font-size: 16px;
    text-align: right;
    padding-right: 20px;
    box-sizing: border-box;
}

.headerBox .baseBox a {
    margin: 0 5px;
    text-decoration: underline;
}

.headerBox .navBox {
    width: 56%;
    display: flex;
}

.headerBox .navBox a {
    margin-right: 10px;
    padding: 0 15px;
    box-sizing: border-box;
    color: #ccc;
    font-size: 18px;
    border-bottom: 4px solid transparent;
    transition: border-bottom-color 0.3s;
}

.headerBox .navBox a:hover,
.headerBox .navBox a.active {
    color: #fff;
    border-bottom-color: #33aaff;
}

/* container */
.container {
    color: #fff;
    display: flex;
    overflow: hidden;
}

.iframeBox {
    width: 82%;
    border: none;
}

.menuBox {
    padding: 20px;
    box-sizing: border-box;
    width: 18%;
    background: #50545e;
    /* 禁止选中 */
    user-select: none;
}

.menuBox .itemBox {
    margin-bottom: 10px;
}

.menuBox .itemBox h3 {
    line-height: 35px;
    font-size: 18px;
    font-weight: normal;
    cursor: pointer;
}

.menuBox .itemBox h3 i {
    margin-right: 4px;
}

.menuBox .itemBox .item {
    padding-left: 25px;
}

.menuBox .itemBox .item a {
    display: flex;
    flex-direction: column;
    line-height: 35px;
    color: #ccc;
    font-size: 16px;
}
